diff --git a/src/profile/identity.rs b/src/profile/identity.rs
index d575bce8..ffc80b5f 100644
--- a/src/profile/identity.rs
+++ b/src/profile/identity.rs
@@ -37,21 +37,18 @@ impl Identity {
         }
     }
 
-    /// Get `pem` record match `request`
-    ///
-    /// https://geminiprotocol.net/docs/protocol-specification.gmi#client-certificates
+    /// Get `pem` record match `request` according to
+    /// [Gemini protocol specification](https://geminiprotocol.net/docs/protocol-specification.gmi#client-certificates)
+    /// * this function work with memory cache not database
     pub fn gemini(&self, request: &str) -> Option<String> {
+        // @TODO apply protocol rules to certificate selection
         for profile_identity_gemini_id in self.gemini.auth.memory.starts_with(request) {
-            if let Ok(gemini_records) = self.gemini.database.records() {
-                for gemini_record in gemini_records {
-                    if gemini_record.id == profile_identity_gemini_id {
-                        return Some(gemini_record.pem);
-                    }
-                }
+            if let Ok(pem) = self.gemini.memory.get(profile_identity_gemini_id) {
+                return Some(pem);
             }
         }
         None
-    } // @TODO apply protocol rules to selection
+    }
 }
 
 // Tools
diff --git a/src/profile/identity/gemini.rs b/src/profile/identity/gemini.rs
index 39577c15..8cb6c96f 100644
--- a/src/profile/identity/gemini.rs
+++ b/src/profile/identity/gemini.rs
@@ -1,8 +1,10 @@
 mod auth;
 mod database;
+mod memory;
 
 use auth::Auth;
 use database::Database;
+use memory::Memory;
 
 use sqlite::{Connection, Transaction};
 use std::{rc::Rc, sync::RwLock};
@@ -12,7 +14,8 @@ use std::{rc::Rc, sync::RwLock};
 /// https://geminiprotocol.net/docs/protocol-specification.gmi#client-certificates
 pub struct Gemini {
     pub auth: Rc<Auth>,
-    pub database: Rc<Database>,
+    // pub database: Rc<Database>,
+    pub memory: Rc<Memory>,
 }
 
 impl Gemini {
@@ -20,9 +23,27 @@ impl Gemini {
 
     /// Create new `Self`
     pub fn new(connection: Rc<RwLock<Connection>>, profile_identity_id: Rc<i64>) -> Self {
+        // Init children components
+        let auth = Rc::new(Auth::new(connection.clone()));
+        let database = Rc::new(Database::new(connection, profile_identity_id));
+        let memory = Rc::new(Memory::new());
+
+        // Build initial index
+        match database.records() {
+            Ok(records) => {
+                for record in records {
+                    if memory.add(record.id, record.pem).is_err() {
+                        todo!()
+                    }
+                }
+            }
+            Err(reason) => todo!("{reason}"),
+        }
+
         Self {
-            auth: Rc::new(Auth::new(connection.clone())),
-            database: Rc::new(Database::new(connection, profile_identity_id)),
+            auth,
+            // database,
+            memory,
         }
     }
 
diff --git a/src/profile/identity/gemini/memory.rs b/src/profile/identity/gemini/memory.rs
new file mode 100644
index 00000000..1f6ee41f
--- /dev/null
+++ b/src/profile/identity/gemini/memory.rs
@@ -0,0 +1,39 @@
+mod error;
+use error::Error;
+
+use std::{cell::RefCell, collections::HashMap};
+
+/// Reduce disk usage by cache index in memory
+pub struct Memory {
+    index: RefCell<HashMap<i64, String>>,
+}
+
+impl Memory {
+    // Constructors
+
+    /// Create new `Self`
+    pub fn new() -> Self {
+        Self {
+            index: RefCell::new(HashMap::new()),
+        }
+    }
+
+    // Actions
+
+    /// Add new record with `id` as key and `pem` as value
+    /// * validate record with same key does not exist yet
+    pub fn add(&self, id: i64, pem: String) -> Result<(), Error> {
+        match self.index.borrow_mut().insert(id, pem) {
+            Some(_) => Err(Error::Overwrite), // @TODO prevent?
+            None => Ok(()),
+        }
+    }
+
+    /// Get `pem` clone by `id` from memory index
+    pub fn get(&self, id: i64) -> Result<String, Error> {
+        match self.index.borrow().get(&id) {
+            Some(pem) => Ok(pem.clone()),
+            None => Err(Error::NotFound),
+        }
+    }
+}
diff --git a/src/profile/identity/gemini/memory/error.rs b/src/profile/identity/gemini/memory/error.rs
new file mode 100644
index 00000000..09edab81
--- /dev/null
+++ b/src/profile/identity/gemini/memory/error.rs
@@ -0,0 +1,5 @@
+#[derive(Debug)]
+pub enum Error {
+    NotFound,
+    Overwrite,
+}